
let s = '';
let x = 100;
while( x > 0 ){
    s += x;
    s += ',';
    x -= 10;
}
console.log( s );

s = '';
for( let x = 100; x > 0 ; x -= 10 ){
    s += x;
    s += '\t';
}
console.log( s );

s = '';
let y = 100;
do {
    s += y;
    s += '\t';
    y -= 10;
} while ( y > 0 );
console.log(s);
